Robertson No. 1
Robertson No. 1 is an earth dam located in Gregory County, South Dakota, built in 1975. It carries a Significant hazard potential classification.
About Robertson No. 1
The primary purpose of Robertson No. 1 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Vjt Holdings Lllp (private). It impounds the Bull Creek.
The dam stands 30 feet tall and stretches 1,500 feet across, and has a maximum storage capacity of 150 acre-feet. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 04/15/1981. That was over 44 years ago.
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Location
| State | South Dakota |
| County | Gregory |
| Nearest City | None |
| River/Stream | Bull Creek |
| Coordinates | 43.33833, -99.46666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,500 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 120 acre-ft |
| Max Discharge | 5,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | VJT HOLDINGS LLLP |
| Owner Type | Private |
| Hazard Classification | Significant |
| Last Inspection | 04/15/1981 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02190 |
| Federal ID | SD02190 |
| More Info | State Dam Safety Program |